will the verizon iphone 4s be unlocked?

Since the 4S is a "world phone" does anyone know whether the Verizon (or Sprint) versions will have an unlocked gsm side? Will we be able to move the phone freely between Verizon, Sprint, and ATT? I'm very curious to see how Apple will handle this situation because to my knowledge, this will be the first time ever that a single identical model will be deployed on ATT, Verizon, and Sprint.

MacRumors attracts a broad audience
of both consumers and professionals interested in
the latest technologies and products. We also boast an active community focused on
purchasing decisions and technical aspects of the iPhone, iPod, iPad, and Mac platforms.